Format of IFSHLP.SYS entry point record:
Offset	Size	Description	)
 00h  4 BYTEs	(call) required signature if called via IOCTL
			70h E9h 34h 37h for Windows 3.11
			70h E9h 35h 37h for Windows 3.11
		(ret) signature 34h 37h 70h EFh (Windows 3.11)
		(ret) signature 35h 37h 70h EFh (Windows95)
 04h	DWORD	(ret) pointer to FAR call entry point (see #01416)